﻿<html>
<head>
<title>“并集”选择符示例</title>
<style type="text/css">
h1,h2,h3{
    color:purple;
}
h2.special,#one{
    text-decoration:underline;
}
</style>
</head>
<body>
<h1>示例文字h1</h1>
<h2 class="special">示例文字h2</h2>
<h3>示例文字h3</h3>
<h4 id="one">示例文字h4</h4>
</body>
</html>